docs(sky): shorten the sky comments and README, fix three stale ones

The far-plane comment said z = w (the code puts z just under w), the Milky
Way constant is a brightness, not an opacity, and the CDS acknowledgement
lives in the Data attribution popover, not DATA_SOURCES.md.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
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German KhokhlovandClaude Opus 5.5 committed 2026-10-20 13:56:44 +04:00
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@@ -93,7 +93,7 @@ test('plate carrée is centred on longitude 0, growing to the left, north up', (
});
test('the galactic rotation puts the Galactic Centre and pole where the IAU does', () => {
// Sgr A*-adjacent origin l = b = 0 at RA 266.405°, Dec −28.936° (J2000).
// Galactic origin l = b = 0 at RA 266.405°, Dec −28.936° (J2000).
const centre = icrfToGalactic(raDecToUnitVector(266.40499, -28.93617));
close(centre[0], 1, 1e-6);
// North galactic pole at RA 192.85948°, Dec +27.12825°.